package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * @Author: zhaoxinlei
 * @Date: 2025/4/2 16:37
 */
@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 统计指定时间区域内的营业额数据
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getOverStatistics(LocalDate begin, LocalDate end) {
        //DateList计算,知道begin和end的日期差值，然后循环遍历，将日期放入dateList中
        // 当前集合用于存放从begin到end的范围内每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        //计算指定日期的后一天对应的日期
        while (!begin.equals(end)) {
            begin=begin.plusDays(1);
            dateList.add(begin);
        }
        // turnoverList用于存放从begin到end的范围内每天对应的营业额数据
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            // 统计每个日期对应的营业额数据,营业额是指状态为已完成的订单的总金额
            //LocalDate只有年月日
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN); //LocalTime.MIN相当于获得0点0分
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);//LocalTime.MAX相当于获得23点59分59秒
            Map map = new HashMap<>();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            // 如果turnover为null，则设置为0.0
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }
        // 返回TurnoverReportVO对象, 将dateList和turnoverList封装到TurnoverReportVO对象中
        return TurnoverReportVO
                // 创建TurnoverReportVO对象
                .builder()
                // 将日期集合转化为字符串，用逗号分隔
                .dateList(StringUtils.join(dateList, ","))
                // 将营业额集合转化为字符串，用逗号分隔
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    /**
     * 统计用户数据
     *
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {

        //存放从begin到end的范围内每天对应的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            begin=begin.plusDays(1);
            dateList.add(begin);
        }

        // 存放从begin到end的范围内每天对应的新增用户数和总用户数
        List<Integer> newUserList = new ArrayList<>();
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //构造map进行封装
            Map map = new HashMap<>();
            map.put("end", endTime);

            //查询总用户数
            Integer totalUser = userMapper.countByMap(map);

            map.put("begin", beginTime);
            //查询当天新增用户数
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }
        //封装结果数据
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .build();
    }

    /**
     * 统计订单数据
     *
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        //存放从begin到end的范围内每天对应的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            begin=begin.plusDays(1);
            dateList.add(begin);
        }
        // 存放从begin到end的范围内每天对应的订单总数和有效订单数
        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validOrderCountList = new ArrayList<>();

        for (LocalDate date : dateList) {
            //构造map进行封装
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);


            //查询每天的订单总数
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            //查询每天的有效订单数
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);


            validOrderCountList.add(validOrderCount);
            orderCountList.add(orderCount);
        }
        //计算总数和有效总数,利用stream流
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();


        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            //计算订单完成率
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 根据状态统计订单数量
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end,Integer status){
        Map map = new HashMap<>();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status",status );
        return orderMapper.countByMap(map);
    }

    /**
     * 统计指定时间区间内的销量排名前10
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        // 构造查询条件
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end,LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        // 将List<GoodsSalesDTO>转换为List<String>, 并拼接成以逗号分隔的字符串
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");

        // 封装结果并返回
        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出运营数据报表
     *
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1.查询数据库获取营业数据-->查询最近30天的数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);
        //查询数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2.通过POI将数据写入Excel文件
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        //获取Excel文件
        try {
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间: " + dateBegin + "至" + dateEnd);

            //填充数据--营业额
            //获得第4行第3列的单元格
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            //填充数据--订单完成率
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            //填充数据--新用户数
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获得第5行第3列的单元格
            row = sheet.getRow(4);
            //填充数据--有效订单数
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            //填充数据--平均客单价
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获取某一行
                 row = sheet.getRow(7 + i);
                 row.getCell(1).setCellValue(date.toString());
                 row.getCell(2).setCellValue(businessData.getTurnover());
                 row.getCell(3).setCellValue(businessData.getValidOrderCount());
                 row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                 row.getCell(5).setCellValue(businessData.getUnitPrice());
                 row.getCell(6).setCellValue(businessData.getNewUsers());
            }
            //3.通过输出流将Excel文件下载到浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            //4.释放资源
            excel.close();
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
